Enhanced Dual-Spectrum Line Interpolated FFT with Four-Term Minimal Sidelobe Cosine Window for Real-Time Harmonic Estimation in Synchrophasor Smart-Grid Technology

Electronics

卷:8

MarceloGodoy Simões¹  VenkataSubrahmanya Raghavendra Varaprasad Oruganti²  VenkataSesha Samba Siva Sarma Dhanikonda²  HelmoKelis Morales Paredes³ 

[1] Department of Electrical Engineering and Computer Science, Colorado School of Mines, 1610, Illinois Street, Golden, CO 8400, USA;

[2] Department of Electrical Engineering, National Institute of Technology Warangal, Warangal 506004, India;

[3] Institute of Science and Technology, São Paulo State University (UNESP), Av. Três de Março, 511, Sorocaba, SP 18087-180, Brazil;

关键词: 4-Term Minimal Sidelobe Cosine Window (4MSCW);    Current harmonics;    Distribution System;    Dual-Spectrum Line Interpolated FFT (DSLIFFT);    Nonlinear loads;    Peak Location Index Search (PLIS);    Renewable Energy Sources;    Synchrophasors;   

DOI  :  10.3390/electronics8020191

来源: DOAJ

【 摘 要 】

The proliferation of nonlinear loads and integration of renewable energy sources require attention for accurate harmonic estimation along with estimation of fundamental amplitude, phase, and frequency for protection, improving power quality, and managing power effectively in a smart distribution grid. There are currently different Windowed Interpolated Fast Fourier Transform (WIFFT) algorithms for harmonic voltage estimation, but estimation of current harmonics using WIFFT is not explored sufficiently. The existing WIFFT algorithms, when used for current harmonic estimation result in low accuracy due to spectral leakage and picket fence effect. On the other hand, Interpolated Discrete Fourier Transform (DFT) is used for synchrophasor quality metrics, but it is effective only when there are no harmonics and the fundamental frequency is constant. This paper proposes a unified solution, comprising of peak location index search (PLIS)-based Dual-Spectrum Line Interpolated Fast Fourier Transform (DSLIFFT) algorithm with 4-Term Minimal Sidelobe Cosine Window (4MSCW) for estimating both low-amplitude voltage or current harmonics and synchrophasor under variable frequency conditions for high-penetration renewable energy utility grids. The effectiveness of the proposed algorithm is validated by simulation studies and real-time experimentation using the National Instruments reconfigurable embedded system under nonlinear loading conditions.

【 授权许可】

Unknown